| 单词 | thorium |
| 释义 | thorium —thoric /thawr"ik, thor"-/, adj. /thawr"ee euhm, thohr"-/, n. Chem. a grayish-white, lustrous, somewhat ductile and malleable, radioactive metallic element present in monazite: used as a source of nuclear energy, as a coating on sun-lamp and vacuum-tube filament coatings, and in alloys. Symbol: Th; at. wt.: 232.038; at. no.: 90; sp. gr.: 11.7. Cf. thoria. [ < NL (1829); see THOR, -IUM] |
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